U.S. patent number 10,984,935 [Application Number 15/557,938] was granted by the patent office on 2021-04-20 for superconducting dipole magnet structure for particle deflection.
This patent grant is currently assigned to Hefei Institutes of Physical Science, Chinese Academy of Sciences. The grantee listed for this patent is Hefei Institutes of Physical Science, Chinese Academy of Sciences. Invention is credited to Feng Jiang, Ming Li, Kun Lu, Yuntao Song, Jing Wei, Xianhu Zeng, Junsheng Zhang, Jinxing Zheng.
United States Patent |
10,984,935 |
Zheng , et al. |
April 20, 2021 |
Superconducting dipole magnet structure for particle deflection
Abstract
A superconducting dipole magnet structure that includes coil
boxes, a dewar and a support device is provided, wherein each of
the coil boxes is of a one-piece structure in which a
superconducting coil is provided, wherein the superconducting coils
are opposite to each other so that a uniform dipole magnetic field
is generated when the two superconducting coils are energized, and
wherein the support device is fixed to the dewar and supports the
coil box in the way of point contact.
Inventors: |
Zheng; Jinxing (Anhui,
CN), Song; Yuntao (Anhui, CN), Lu; Kun
(Anhui, CN), Zhang; Junsheng (Anhui, CN),
Wei; Jing (Anhui, CN), Li; Ming (Anhui,
CN), Jiang; Feng (Anhui, CN), Zeng;
Xianhu (Anhui, CN) |
Applicant: |
Name |
City |
State |
Country |
Type |
Hefei Institutes of Physical Science, Chinese Academy of
Sciences |
Anhui |
N/A |
CN |
|
|
Assignee: |
Hefei Institutes of Physical
Science, Chinese Academy of Sciences (Hefei,
CN)
|
Family
ID: |
1000005501591 |
Appl.
No.: |
15/557,938 |
Filed: |
May 2, 2017 |
PCT
Filed: |
May 02, 2017 |
PCT No.: |
PCT/CN2017/082727 |
371(c)(1),(2),(4) Date: |
September 13, 2017 |
PCT
Pub. No.: |
WO2018/201279 |
PCT
Pub. Date: |
November 08, 2018 |
Prior Publication Data
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|
|
|
Document
Identifier |
Publication Date |
|
US 20200058424 A1 |
Feb 20, 2020 |
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H01F
6/06 (20130101); H05H 13/005 (20130101); H05H
7/04 (20130101); A61N 5/1077 (20130101); H05H
2007/046 (20130101); A61N 2005/1087 (20130101) |
Current International
Class: |
H01F
1/00 (20060101); H05H 13/00 (20060101); H05H
7/04 (20060101); H01F 6/06 (20060101); A61N
5/10 (20060101) |
Field of
Search: |
;335/216 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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101307862 |
|
Nov 2008 |
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CN |
|
102360692 |
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Feb 2012 |
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CN |
|
103106994 |
|
May 2013 |
|
CN |
|
103177841 |
|
Jun 2013 |
|
CN |
|
105070458 |
|
Nov 2015 |
|
CN |
|
Other References
Yin-Feng, Zhu, "Design and heat load analysisof support structure
of CR superconducting dipole magnet forFAIR", Nuclear Fusion and
Plasma Physicsvol. 28, No. 3, (Sep. 2008), 5 pgs. cited by
applicant .
"International Application Serial No. PCT2017082727 International
Written Opinion dated Aug. 2, 2018", (Aug. 2, 2018), 6 pgs. cited
by applicant .
"International Application Serial No. PCT2017082727 International
Search Report dated Aug. 2, 2018", (Aug. 2, 2018), 6 pgs. cited by
applicant.
|
Primary Examiner: Ismail; Shawki S
Assistant Examiner: Homza; Lisa N
Attorney, Agent or Firm: Schwegman Lundberg & Woessner,
P.A.
Claims
The invention claimed is:
1. A superconducting dipole magnet structure that comprises two
coil boxes, a dewar and a support device, wherein each of the coil
boxes is of a one-piece structure in which a superconducting coil
is provided, wherein the superconducting coils are opposite to each
other so that a uniform dipole magnetic field is generated when the
two superconducting coils are energized, and wherein the support
device is fixed to the dewar and supports the coil box in the way
of point contact.
2. The superconducting dipole magnet structure according to claim
1, wherein the point contact is achieved such that the support
device supports the coil box by means of pins, wherein the support
device comprises a main support, and the pins are provided on the
main support, and wherein an end surface of each of the pins is
directly opposite to the coil box.
3. The superconducting dipole magnet structure according to claim
2, wherein the support device fixes and supports the coil box by
means of bolts, and the main support and the coil box are connected
by means of bolts.
4. The superconducting dipole magnet structure according to claim
3, wherein the periphery of the bolts and pins between the support
device and the coil box is provided with a heat insulating member
to reduce the heat transfer between the support device and the coil
box, and heat insulation from outside is achieved.
5. The superconducting dipole magnet structure according to claim
2, wherein the superconducting dipole magnet structure further
comprises a heat insulating plate in which a through hole is
formed, the main support of the support device passes through the
hole and a portion of the support device is supported by the heat
insulating plate, and the dewar indirectly supports the support
device embedded in the heat insulating plate by supporting the end
of the heat insulating plate.
6. The superconducting dipole magnet structure according to claim
5, wherein an elongated circuit is formed between the heat
insulating plate and the main support to reduce the heat leakage,
and a convex structure is provided on the wall of the through
hole.
7. The superconducting dipole magnet structure according to claim
1, wherein the superconducting dipole magnet structure further
comprises a dewar and two thermal shields, wherein the thermal
shields are arranged at the periphery of the coil boxes and vacuum
is formed therebetween, and wherein the dewar is arranged outside
the thermal shields and vacuum is formed therebetween.
8. The superconducting dipole magnet structure according to claim
7, wherein the thermal shield is supported by the support device,
and a heat insulating member is provided on a portion of the
support device supporting the thermal shield.
9. A transport device for transporting particles and/or heavy ions,
comprising: the superconducting dipole magnet structures according
to claim 1 that is provided on a preset transport path of particles
and/or heavy ions to achieve deflection of the particle beam.
10. A medical device, characteristics comprising: a particle
accelerator, a therapeutic device, and a transport device according
to claim 9, wherein the transport device for the particle is
disposed at downstream of the accelerator and at upstream of the
therapeutic device, so that the particles and/or heavy ions
accelerated by the accelerator are transported to the therapeutic
device.
11. The medical device according to claim 10, wherein the point
contact is achieved such that the support device supports the coil
box by means of pins, wherein the support device comprises a main
support, and the pins are provided on the main support, and wherein
an end surface each of the pin is directly opposite to the coil
box.
12. The medical device according to claim 11, wherein the support
device fixes and supports the coil box by means of bolts, and the
main support and the coil box are connected by means of bolts.
13. The medical device according to claim 10, wherein each of a
periphery of a portion of each bolt that is disposed between the
support device and the coil box and a periphery of each pin that is
disposed between the support device and the coil box is provided
with a heat insulating member to reduce the heat transfer between
the support device and the coil box, and heat insulation from
outside is achieved.
14. The transport device according to claim 9, wherein the point
contact is achieved such that the support device supports the coil
box by means of pins, wherein the support device comprises a main
support, and the pins are provided on the main support, and wherein
an end surface of each of the pins is directly opposite to the coil
box.
15. The transport device according to claim 14, wherein the support
device fixes and supports the coil box by means of bolts, and the
main support and the coil box are connected by means of bolts.
16. The transport device according to claim 15, wherein the
periphery of the bolts and pins between the support device and the
coil box is provided with a heat insulating member to reduce the
heat transfer between the support device and the coil box, and heat
insulation from outside is achieved.
17. The transport device according to claim 14, wherein the
superconducting dipole magnet structure further comprises a heat
insulating plate in which a through hole is formed, the main
support of the support device passes through the hole and a portion
of the support device is supported by the heat insulating plate,
and the dewar indirectly supports the support device embedded in
the heat insulating plate by supporting the end of the heat
insulating plate.
18. The transport device according to claim 17, wherein an
elongated circuit is formed between the heat insulating plate and
the main support to reduce the heat leakage, and a convex structure
is provided on the wall of the through hole.
19. The transport device according to claim 9, wherein the
superconducting dipole magnet structure further comprises a dewar
and two thermal shields, wherein the thermal shields are arranged
at the periphery of the coil boxes and vacuum is formed
therebetween, and wherein the dewar is arranged outside the thermal
shields and vacuum is formed therebetween.
20. The transport device according to claim 19, wherein the thermal
shield is supported by the support device, and a heat insulating
member is provided on a portion of the support device supporting
the thermal shield.
Description
PRIORITY APPLICATIONS
This application is a U.S. National Stage Filing under 35 U.S.C.
371 from International Application No. PCT/CN2017/082727, filed on
2 May 2017, and published as WO/2018/201279 on Nov. 8, 2018; which
application and publication are incorporated herein by reference in
its entirety.
TECHNICAL FIELD
The present disclosure relates to a field of superconducting
magnets, and particularly to a superconducting dipole magnet
structure for particle deflection.
BACKGROUND
The medical technology of particle beam was developed from the
United States in 1946 when Wilson firstly proposed particle beam
treatment characteristics. There is a Bragg peak in particle beam.
The Bragg peak can be adjusted to a tumor area through
high-precision computer control technology, and large amounts of
energy can be released. With the development of the medical
technology of particle beam for half a century, particle therapy
becomes a remarkable high and new technology for treatment of
cancer because of its penetrating power, good dose distribution,
less side scattering and other characteristics. With the continuous
development of particle medical technology, heavy ion medical
technology is also being developed continuously. In terms of beam
type, heavy ions, especially carbon ions, are preferable because of
their physical Bragg effect and special relative biological
effect.
To achieve the particle and heavy ion medical treatment, the
corresponding medical devices are needed. Considering the principle
of structural composition, heavy ion and particle therapy systems
are substantially the same, including accelerators, particle
transport system, nozzle and treatment planning system. And with
the rapid development of accelerator science, it has been difficult
for conventional magnet accelerators to meet the requirements of
various disciplines for high energy particle beam. Due to the high
requirements of heavy ion and particle transporting for magnetic
rigidity, the magnetic rigidity for deflecting heavy ion is 6.3 Tm
and that for proton is 2.15 Tm, which makes it difficult to design
the magnet used in the particle beam transport process because of
the difficulty of achieving high strength magnetic field with
traditional magnet. The only way for this is to increase the size
of the magnet to meet the requirements, which makes the size and
weight of existing transport system huge. As it is difficult for
the conventional magnet to achieve electromagnetic field of high
strength, the only way for this is to increase the radius of
curvature to meet the requirements, which makes the existing gantry
system huge and heavy. Especially for the last bending magnet, the
weight of 90 degree bending magnet increases rapidly as the radius
thereof increases. Taking Germany GSI HIT as an example, the weight
of the 90-degree bending magnet is up to 90 tons, accounting for
65% of the weight of the entire gantry system. Excessive gantry
weight will lead to severe deformation due to the uneven stress,
thus affecting the isocentric error and rotation accuracy,
hindering the wide application of ion beam medical treatment. The
bending magnet is an important component of rotating gantry to
realize the deflection function of iron beam and is an important
factor for the size and weight of rotary gantry. Therefore, it is
necessary to change the magnet structure and develop new magnet so
as to overcome the defects of existing gantry of large size, high
weight and high cost.
SUMMARY
According to an aspect of the present disclosure, there is provided
a superconducting dipole magnet structure which includes two coil
boxes, a dewar and a support device, wherein each of the coil boxes
is of a one-piece structure in which a superconducting coil is
provided, the superconducting coils are opposite to each other so
that a uniform dipole magnetic field is generated when the two
superconducting coils are energized, and wherein the support device
is fixed to the dewar and supports the coil box in the way of point
contact.
According to another aspect of the present disclosure, a transport
device is provided for transporting particles and/or heavy ions,
including:
any of the above-described superconducting dipole magnet structures
that is provided on the preset transport path of particles and/or
heavy ions to achieve deflection of the particle beam.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic view of the superconducting dipole magnet
structure according to the present disclosure;
FIG. 2 is a schematic view of a partial section of the
superconducting dipole magnet in FIG. 1;
FIG. 3 is a cross-sectional view of the superconducting dipole
magnet in FIG. 1;
FIG. 4 is a schematic view of the support device and the coil box
in FIG. 1;
FIG. 5 is a cross-sectional view of the coil box in FIG. 1;
FIG. 6 is a schematic view of the superconducting coil in FIG.
1;
FIG. 7 is a cross-sectional view of the superconducting coil in
FIG. 1;
FIG. 8 is a perspective view of the support device in FIG. 1;
FIG. 9 is a top view of the support device in FIG. 1;
FIG. 10 is a cross-sectional view of the support device in FIG.
1;
FIG. 11 is a schematic view of the iron yoke in FIG. 1;
FIG. 12 is a schematic view of the dewar in FIG. 1;
FIG. 13 is a schematic view of the cold screen thermal shield in
Figure. 1;
FIG. 14 is a layout of beam transport device according to the
present disclosure.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
The disclosure will now be described with reference to the drawings
and the embodiments to provide a thorough understanding on the
purpose, the technical solution and the advantages of the present
disclosure.
According to an aspect of the present disclosure, there is provided
a superconducting dipole magnet structure which includes two coil
boxes, a dewar and a support device, wherein each of the coil boxes
is of a one-piece structure in which a superconducting coil is
provided, the superconducting coils are opposite to each other so
that a uniform dipole magnetic field is generated when the two
superconducting coils are energized, and wherein the support device
is fixed to the dewar and supports the coil box in the way of point
contact.
Further, the point contact is achieved such that the support device
supports the coil box by means of pins, wherein the support device
includes a main support, and the pins are provided on the main
support, and wherein an end surface of the pin is directly opposite
to the coil box.
Further, the support device fixes and supports the coil box by
means of bolts, and the main support and the coil are riveted by
means of bolts.
Further, the periphery of the bolts and pins between the support
device and the coil box is provided with a heat insulating member
to reduce the heat transfer between the support device and the coil
box, and heat insulation from outside is achieved.
Further, the superconducting dipole magnet structure includes a
dewar and two thermal shields, wherein the thermal shields are
arranged at the periphery of the coil boxes and vacuum is formed
therebetween, wherein the dewar is arranged outside the thermal
shields and vacuum is formed therebetween, and wherein the
superconducting dipole magnet structure further comprises a liquid
cold source that is provided by means of a refrigerator to provide
a constant temperature.
Further, the thermal shield is supported by the support device, and
a heat insulating member is provided on a portion of the support
device supporting the thermal shield.
Further, the superconducting dipole magnet structure further
includes a heat insulating plate in which a through hole is formed,
the main support of the support device passes through the hole and
a portion of the support device is supported by the heat insulating
plate, and the dewar indirectly supports the support device
embedded in the heat insulating plate by supporting the end of the
heat insulating plate.
Further, a elongated circuit is provided between the heat
insulating plate and the main support to reduce the heat leakage,
and a convex structure is provided on the wall of the through
hole.
According to another aspect of the present disclosure, a transport
device is provided for transporting particles and/or heavy ions,
including:
any of the above-described superconducting dipole magnet structures
that is provided on the preset transport path of particles and/or
heavy ions to achieve deflection of the particle beam.
According to another aspect of the present disclosure, a medical
device is provided which includes a particle accelerator, a
therapeutic device, and a transport device described above, wherein
the transport device for the particle is disposed at downstream of
the accelerator and at upstream of the therapeutic device, so that
the particles and/or heavy ions accelerated by the accelerator can
be transported to the therapeutic device.
According to the above-described technical solution, it is possible
to obtain the following advantageous effects of the present
disclosure: 1. The special support device can meet the structural
strength requirements while ensuring the achievement of reducing
heat transfer; 2. The support device can achieve connection and
positioning between the coil box and the thermal shield by means of
the bolts and the pins; 3. The periphery of the support device is
wrapped with heat insulating members (such as G10 ring) to reduce
the heat transfer between the coil box and the thermal shield; the
structural connection and the reduction of heat transfer between
the thermal shield and the dewar are also achieved by the similar
structure; the housing of the dewar is made of stainless steel and
is internally vacuumized; finally, the beam stream deflecting
function of the coil is achieved under a working condition of a low
temperature of 4K; 4. The superconducting magnet structure based on
superconducting material (such as NbTi) can effectively increase
the magnetic field in the effective region of the dipole magnet
while realizing the particle beam deflection function, and realize
small, lightweight and cheap development of particle beam transport
system, which plays an important role in technical development and
extensive use of particle beam therapy; 5. The medical device of
the present disclosure mainly adopts the structure design of
superconducting dipole magnet of the accelerator technology,
achieving functions of high current stable operation, magnet
cooling in the liquid helium temperature region, quench protection,
steady magnetic field with high strength, and so on.
In the present disclosure, the term "point contact" means that the
coil box and the support device are contacted by way of one or more
points on the face, where the point may be circular, oval in shape,
or be of other planar shape. The purpose of doing this is to reduce
the contact area as much as possible so as to reduce the heat
transfer between the coil box and the support device. The above
"contact" may be achieved by a variety of ways, including but not
limited to other support structures, such as supporting posts of
heat insulating material (G10 epoxy material) provided on the
support device which is fixed to the coil box.
The basic concept of the present disclosure is to propose a
superconducting dipole magnet structure suitable for accelerator
technology, which includes a support device with a specific
structure. The superconducting dipole magnet structure greatly
increases carrying current density of the coil while ensuring the
strength of the magnet structure.
FIG. 1 is a schematic view of the superconducting dipole magnet
structure according to the present disclosure, and FIG. 4 is a
schematic view of the support device and the coil box in FIG. 1.
Referring to FIG. 1 and FIG. 4, the superconducting dipole magnet
structure includes coil boxes 5 and a supporting device 9, wherein
each of the coil box 5 is of a one-piece structure in which a
superconducting coil is provided, the superconducting coils are
opposite to each other (including the upper coil 19 and the lower
coil 20 when the coils are directly opposite in the vertical
direction) so that a magnetic field is generated when the two
superconducting coils are energized, and wherein the support device
9 supports the coil box 5 in the way of point contact.
The superconducting dipole magnet structure is an important
component in the particle and/or heavy ion transport device. The
role of the transport device is to ensure an unobstructed transport
of the particle beam in the vacuum pipe. The transport device
mainly includes the main transport system and a rotary gantry,
wherein the gantry includes the superconducting dipole magnet
structure.
FIG. 1 is that the superconducting dipole magnet structure is of an
arc-shaped structure as a whole, and the angle of the arc-shaped
structure corresponds to the angle by which the particles will be
deflected. An arc-shaped beam stream vacuum pipe 4 is arranged
inside the arc-shaped structure, the entrance and exit thereof are
arranged on two sides of the superconducting dipole magnet
structure, the particles pass through the superconducting dipole
magnet structure from one side to the other side, achieving the
angle deflection. The superconducting dipole magnetic structure may
include a superconducting magnet cooling system 1 and a
superconducting magnet coil system 3. The superconducting magnet
cooling system 1 is used to maintain a constant operating
temperature of superconducting coil and the superconducting magnet
coil system 3 is used for producing a stable electromagnetic
field.
FIG. 2 is a schematic view of a partial section of the
superconducting dipole magnet in FIG. 1; and FIG. 3 is a
cross-sectional view of the superconducting dipole magnet in FIG.
1. As shown in FIG. 2 and FIG. 3, the superconducting magnet coil
system 3 may include the cold screen 6, the dewar 7 and the cooling
pipe 8. The support device 9 is supported on the dewar 7 with a
heat insulating member 11 and a heat insulating plate 12
therebetween. As shown in FIG. 12 and FIG. 13, the housing of the
dewar 7 is made of stainless steel, and the dewar is vacuumized.
Finally, a beam stream deflection function of the superconducting
magnet is achieved when the internal superconducting coils are
energized under a condition of a low temperature of 4K. The cold
screen 6 is made of copper, located between the dewar and the coil
boxes, is in a vacuum environment, and is fixed by the support
device. The dewar 7 is mainly used to provide a vacuum environment,
achieving a vacuum heat insulating effect. The cold screen 6 mainly
plays a role of reducing thermal radiation.
FIG. 4 is a schematic view of the support device and the coil boxes
in FIG. 1. The support device 9 is used to support the coil box 5
(including the components inside the coil boxes). In order to
reduce the influence of the support device 9 on the temperature
inside the coil box 5, the contact area between the support device
9 and the coil box 5 should be as low as possible. By the point
contact way, the corresponding contact area can be reduced, thereby
improving the heat insulating coefficient. In addition, a heat
insulating member can be placed at the contact portion to further
improve the heat insulating effect.
In some embodiments, the coil box 5 may be supported by means of
bolts and pins in a point contact manner to achieve the coupling
and positioning between the coil box and the thermal shield. The
support device supports the coil box 5 (which is provided with an
opening for receiving the pins) by means of the pins 14. The
support device 9 includes a main support 10, wherein the pins are
provided on the main support 10 and the ends of pins is directly
opposite to the coil box. The support device 9 further fixes and
supports the coil box by bolts 17, and the main support and the
coil box are riveted by means of bolts. Riveting by bolt means that
the bolt is screwed into the threaded hole in one of the two parts
to be connected so as to connect the two parts together.
In some embodiments, the bolts 17 and the pins 14 at the top of the
support structure are wrapped with heat insulating members (13, 16)
(e.g., G10 rings) to reduce the thermal conductivity between the
coil box and the main support.
In some embodiments, the coil box 5, the thermal shield 6 and the
dewar 7 are independent of each other and can only be connected
through the support device.
In a preferable embodiment, the thermal shield 6 is supported by
the support device 9, and a heat insulating member is provided
between the support device 9 and the thermal shield 6.
FIG. 5 is a cross-sectional view of the coil boxes in FIG. 1. Each
of the coil boxes 5 is of a one-piece structure in which a
relatively closed space is formed to facilitate the transport of
the particles and to improve the uniformity of the cross-section
and the uniformity of the integral magnetic field in the good field
area in the beam stream aperture.
Opposite coils are provided inside the coil boxes. The coils can be
divided into an upper coil 19 or a lower coil 20 if the two coils
are vertically opposite. The upper coil 19 and the lower coil 20
are connected in series to the external circuit and the current
flows through them in a same direction. Then a unidirectional
uniform dipole magnetic field is generated in the magnet gap. The
upper coil 19 and the lower coil 20 are used to generate a magnetic
field with a certain strength to deflect the particle beam after
being energized. A coil body electrical insulating member 21 and a
cooling channel 22 is provided outside the coils.
FIG. 6 is a schematic view of the superconducting coil in FIG. 1;
and FIG. 7 is a cross-sectional view of the superconducting coil in
FIG. 1. Referring to FIG. 6 and FIG. 7, the upper coil 19 and the
lower coil 20 are made of high-temperature superconducting
material, (Such as YBCO) or low-temperature superconducting
material (such as NbTi). Since the large size and the heavy weight
of the conventional magnet, the performance of the magnet is
restricted. The superconducting material can improve the field
strength of the dipole magnet so that the bending radius of the
magnet is effectively reduced and the overall length of the gantry
is then reduced. Thus, the whole structure is more compact, the
load on the gantry can be reduced to ensure stable transmission of
the beam stream. There are coil layer electrical insulating members
27 between respective turns of the upper coil 19.
FIG. 8 is a perspective view of the support device in FIG. 1; FIG.
9 is a top view of the support device in FIG. 1; and FIG. 10 is a
cross-sectional view of the support device in FIG. 1. Referring to
FIGS. 8-10, the support device according to the present embodiment
mainly includes a main support 10 and a heat insulating member 30.
The heat insulating member 30 supports the thermal shield 6. The
coil box 5 is connected and supported by the main support 10
through the bolts 17 and the pins 14 at the upper part of the main
support 10. The pins 14 are used to realize radial positioning and
the bolts 17 are used for fixing, realizing axial positioning. The
main support 10 is also used to support the cold screen 6 provided
outside the coil box 5. The contact manner between the cold screen
6 and the main support 10 is different from that between the coil
box 5 and the main support 10, so that there is no direct contact
between the coil box 5 and the cold screen 6.
As is shown in Figure 8, the support device 9 further includes a
heat insulating plate 12 (e.g., a G10 plate) in which a through
hole 32 is provided. The main support 10 passes through the through
hole 32 and is supported by the heat insulating plate 12. The dewar
7 indirectly supports the main support 10 embedded in the heat
insulating plate by supporting the end of the heat insulating plate
12.
Preferably, a heat insulating member 11 (e.g., G10 block) is
provided on the heat insulating plate 12 where the heat insulating
plate 12 is in contact with the dewar 7, further improving the heat
insulation effect.
Preferably, in order to increase the strength of the coupling
structure consisting of the heat insulating plate 12 and the main
support 10 and to reduce the contact area therebetween, as shown in
FIG. 8, a convex structure 33 including a plurality of protrusions
is provided at the periphery of the central opening of the heat
insulating plate.
It is further preferred that an elongated circuit 32 is formed
between the main support 10 and the heat insulating plate 12 to
increase the length of the heat conduction path. The heat transfer
circuit is shown in FIG. 10 with a thick dash line. The elongated
circuit 31 is realized with curved shape of main support 10.
In some embodiments, the superconducting dipole magnet structure
further includes an iron yoke 2, as shown in FIG. 1 and FIG. 11,
which are substantially H-typed. The iron yoke 2 consists two
symmetrical portions and are assembled of half structures. The
superconducting coil system is provided inside the iron yoke 2, and
the outer surface of the dewar 7 is fitted and fixed to the inside
of the iron yoke 2, and the iron yoke 2 is mainly used to increase
the field strength and to improve the magnetic field
uniformity.
FIG. 14 is a schematic diagram showing a layout of a transport
device according to an embodiment of the present disclosure. The
present disclosure also provides a transport device for
transporting particles and/or heavy ions. The transport device
includes a plurality of dipole magnet structures, at least one of
which adopts the superconducting dipole magnet structure as
described above. Each of the superconducting dipole magnet
structures is placed in preset transmission path for
particles/heavy ions to achieve deflection of the particle beam.
According to one embodiment, a 60-degree dipole magnet 23 in FIG.
14 first deflects the ion beam from the axis, and then other two
superconducting dipole magnet structures (a 60-degree dipole magnet
24 and a 90-degree dipole magnet 25) or more superconducting dipole
magnet structures (indicated by the dashed lines in FIG. 14)
reversely deflect them in the beam stream vacuum pipe 26 so that
the beam stream is perpendicular to the rotation axis of the rotary
gantry.
The present disclosure further provides a medical device which
includes a particle accelerator, a transport device for particle
described above and a therapeutic device, wherein the transport
device for the particle is disposed at downstream of the
accelerator and at upstream of the therapeutic device, so that the
particles and/or heavy ions accelerated by the accelerator can be
transported to the therapeutic device. The superconducting magnet
is different from a conventional magnet which requires a large
water supply and purification system, and the superconducting
magnet is of light weight, small size, high stability, uniformity,
and low energy consumption. The characteristics of high field
strength and high stability of superconducting magnet can rotate
the gantry for proton treatment. With such an arrangement, the
weight of the gantry can be greatly reduced due to the 90 degree
dipole magnet at the end of path of particle according to the
present disclosure. Therefore, such design will be the key to the
application development of ion beam therapy technology, and there
is great significance in promotion for the application of the
superconducting technology in the field of medical physics
development.
With the above-described embodiments of the present disclosure, the
above-mentioned special cooling and support device ensures a
low-temperature cooling effect of the magnet and a high-strength
and steady-state uniform magnetic field, thereby finally achieving
the deflection of the particle beam. At the same time, the special
structural features thereof can effectively reduce the size, weight
and cost of the magnet, and ensure the safe release of the current
in the magnet in the failure such as quench.
The objects, technical solutions and advantages of the present
disclosure has been described in the foregoing detailed
description. It will be understood that the above description only
relates to particular embodiments according to the present
disclosure and is not intended to limit the present disclosure and
that any modifications, equivalents, improvements within the spirit
and principles of the present disclosure are intended to be
included within the scope of the present disclosure.
* * * * *